Abstract: A wheel housing shell for a vehicle having an underbody that faces a roadway, on which the motor vehicle travels during operation. During operation of the vehicle on a wet roadway, in particular when driving through shallow water, for example when aquaplaning, splash water is displaced from the wheels of the motor vehicle, which forms fountains that in turn generate at least one splash water force. To improve the wheel housing shell for the motor vehicle with respect to driving through shallow water, for example when aquaplaning, the wheel housing shell has a splash water drainage geometry in a rear region in relation to a forward driving direction, which is configured and arranged, such that the splash water in the rear region of the hydropower-optimized wheel housing shell is tangentially discharged downwards in the direction of the roadway by the splash water drainage geometry during operation of the motor vehicle.

Abstract: An air guiding device of a motor vehicle body includes a roof spoiler arranged on a rearward end of a roof of the motor vehicle body and above a rear window of the motor vehicle body. The roof spoiler includes a first spoiler portion extending along a transverse body axis (Y) and a second spoiler portion extending along a vertical body axis (Z). The roof spoiler includes an unmovable air guiding element and a movable air guiding element, which is movably received in an element opening of the unmovable air guiding element. For water drainage, the air guiding device includes a channel system, which is configured so as to receive and discharge water. The roof spoiler includes a spoiler entry opening. The channel system is configured so as to guide the water starting from the spoiler entry opening via the second spoiler portion to an environment.